DRC-2009-001002 - 0901a0688010f4d4

DENISOI^/
MINES
April 3, 2009
VIA Electronic Mail (PDF) and Federal Express
Dane L. Finerfi'ock, Executive Secretary
Utah Radiation Control Board
Utah Department of Environmental Quality
168 North 1950 West
P.O. Box 144810
Salt Lake City, UT 84114-4810
,00 'CC^
Denbon Mines (USA) Corp.
1050 ITtti Street, Suite 990
Denvw, CO 8026S
USA
Tel: [phone]
Fax:[phone]S
www.denisdnminet.coin
Re: State of Utah Ground Water Discharge Permit No. UW370004 (the "GWDP")
White Mesa Uranium Mill - Notice Pursuant to Part I.G.I(a)
Dear Mr. Finerfrock:
The White Mesa uranium mill (the "Mill") completed its 1^' quarter, 2009 groundwater sampling
under the GWDP on Febmary 3, 4, 9, & 11, 2009. The final analytical results of these samplings
were issued on March 5, 17, 23, & 24, 2009
Under the GWDP it is intended that background groimdwater quality will be determined on a
well-by-well basis, as defined by the mean plus second standard deviation concentration. The
Mill is currently in the process of working with the Utah Division of Radiation Control to
establish backgroimd (including the mean plus standard deviation) for all of the constituents
being sampled under the GWDP. Until background is established, the GWDP requires that
constituent concentrations in each monitoring well shall not exceed the Groimdwater Control
Limits ("GWCLs") set out in Table 2 of the GWDP.
Pursuant to Part I.G.I.a) of the GWDP, please take notice that the concentrations of the
following constituents in the following monitoring wells for the 1^' Quarter of 2009 exceeded
their respective GWCLs in Table 2 of the Permit:
Table 1 - GWCL Exceedances for the Quarter
Monitoring WeU
(Wat^r Glass)
MW-14 (Class UI)
Constituent
Manganese
GWCL
(ug/L)
400
Sample Reisult
(iig/L)
2,190
Monitoring AVell
(Water Class)
MW-14 Contd.
MW.26 (Class III)
MW-32 (Class IID
Constituent
Uranium
Manganese
Uranium
Chloroform
Dichlormethane
Cadmium
Manganese
Nickel
Iron
GWCL
(ug/L)
15
400
15
35
2.5
2.5
400
50
5,500
Sample Result
(ug/L)
60.5
1,370
43
1,600
89
2.98
5,170
63
9,180
Unless the compliance status for any constituents in any wells is determined otherwise by the
Executive Secretary, the Mill will, pursuant to Part I.G.I.b)l) of the Permit, commence or
continue, as the case may be, accelerated sampling of each of the foregoing constituents in its
respective well on a monthly or quarterly basis, as applicable, and as set forth below:
Table 2 - Accelerated Monitoring Requirements as of April 3,2009
Monitoring Well
(Water Class)
MW-1
(Class ID
MW-3
(Class III)
MW-5
(Class II)
MW-12
(Class III)
MW-14
(Class UT)
MW-15
(Class IID
Constituent
Tetrahydrofuran
Manganese
Manganese
Selinium
Thallium
Uranium
Tetrahydrofuran
Manganese
Fluoride
Tetrahydrofuran
Manganese
Uranium
Manganese
Uranium
Selenium
Uranium
Nbrnial
; Frequency of
Sampling
Semi-Annual
Semi-Annual
Semi-Annual
Semi-Annual
Semi-Annual
Semi-Annual
Semi-Annual
Semi-Annual
Semi-Annual
Semi-Annual
Semi-Annual
Semi-Annual
Quarterly
Quarterly
Semi-Annual
Semi-Annual
Accelerated
Frequency of
Sampling
Quarterly
Quarterly
Quarterly
Quarterly
Quarterly
Quarterly
Quarterly
Quarterly
Quarterly
Quarterly
Quarterly
Quarterly
Monthly
Monthly
Quarterly
Quarterly
Commencement of
Accelerated
Monitoring
4" Quarter 2005
1" Quarter 2006
1" Quarter 2006
3"* Quarter 2006
4* Quarter 2005
4* Quarter 2005
3"" Quarter 2006
4"" Quarter 2005
4"" Quarter 2005
1" Quarter 2006
4" Quarter 2005
4" Quarter 2005
June 2005
June 2005
4" Quarter 2005
4" Quarter 2005
DENISOI^ii MINES
Mqnitqiring Well;
':;;;(Wat(W^Pass) 1
MW-17
(Class III)
MW-18
(Class II)
MW-19
(Class ID
MW-26
(Class IID
MW-32
(Class IID
^i ••;" .Gbnistitiient: \' :}•'•••
Uranium
Thalium
Thallium
Uranium
Manganese
Fluoride
Selenium
Thallium
Uranium
Nitrate
Manganese
Uranium
Chloroform
Dichloromethane
Cadmium
Iron
Manganese
Nickel
Gross Alpha
.-•;'Npriiial..-:;
-Frequency of 4
r : Sainipiing:^: -V
Semi-Annual
Semi-Annual
Semi-Annual
Semi-Annual
Semi-Annual
Semi-Annual
Semi-Annual
Semi-Annual
Semi-Annual
Semi-Annual
Quarterly
Quarterly
Quarterly
Quarterly
Quarterly
Quarterly
Quarterly
Quarterly
Quarterly
Acteleratedv"
::':FiriE!quehcy6iF.i;^
j.:i-.. Sampling'T/I:.!.
Quarterly
Quarterly
Quarterly
Quarterly
Quarterly
Quarterly
Quarterly
Quarterly
Quarterly
Quarterly
Monthly
Monthly
Monthly
Monthly
Monthly
Monthly
Monthly
Monthly
Monthly
: Gommeniceimenfof;
y - .•*;;; Accel^riied-;;.; 'ii-^
i::-': ; Monitoring -Ok
4" Quarter 2005
I''Quarter 2006
4" Quarter 2005
4" Quarter 2005
January, 2008
I''Quarter 2006
4* Quarter 2005
l"* Quarter 2006
4"" Quarter 2005
l"* Quarter 2009
June 2005
June 2005
June 2005
September 2005
June 2005
June 2005
June 2005
June 2005
March 2007
If you have any questions or require any further information, please contact the undersigned.
Yours very tmly,
DENISON MINES (USA) CORP.
STEVEN D. LANDAU
Manager, Environmental Affairs
cc: Ron Hochstein
Harold Roberts
David Frydenlund
David Turk
DENISO MINES
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